%0 Journal Article
%T Effects of nitrogen supply on nutritional quality and antioxidative enzyme activities of spinach<br>供氮水平对菠菜营养品质和体内抗氧化酶活性的影响
%A ZHANG Yingpeng
%A LIN Xianyong
%A ZHANG Yongsong
%A <br>张英鹏
%A 林咸永
%A 章永松
%J 应用生态学报
%D 2005
%I 
%X A hydroponic experiment was carried out to study the effects of nitrogen (N) supply on the nutritional quality and antioxidative enzyme activities of spinach. The results showed that when the N supply increased from 4 to 8 mmol x L(-1), the biomass of spinach and its leaf vitamin C (Vc) content increased significantly, but a further increase of the N supply induced an obvious decrease of Vc content. An increasing N supply increased the nitrate content in leaves. The soluble oxalate content in leaves decreased slightly with the N supply from 4 to 8 mmol x L(-1) N, but increased with a further increase of supplied N. Total oxalate content increased firstly, and then decreased with increasing N supply. SOD and POD activities increased with the N level up to 8 mmol x L(-1) N, but drastically decreased with increasing N levels. CAT activity decreased when N level elevated. MDA content decreased firstly and then increased with increasing N levels, while free proline content decreased with increasing N supply. All of these indicated that 8 mmol x L(-1) N was an appropriate N supply level for spinach to improve its biomass, nutritional quality, and resistance.
%K Spinacia oleracea
%K Nitrogen supply
%K Nitrate
%K Vitamin C
%K Oxalate
%K Antioxidative enzyme activities
%K Proline<br>菠菜
%K 供氮水平
%K 硝酸盐
%K 维生素
%K 草酸
%K 抗氧化酶活性
%K 脯氨酸
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=90BA3D13E7F3BC869AC96FB3DA594E3FE34FBF7B8BC0E591&jid=42FEDDFE54F8BCD9D5FD1926ABDD7722&aid=E1E13A4A7CEDBCD5&yid=2DD7160C83D0ACED&vid=7801E6FC5AE9020C&iid=38B194292C032A66&sid=89389F643CA3F778&eid=C81D738643975BB0&journal_id=1001-9332&journal_name=应用生态学报&referenced_num=7&reference_num=34